Schedule 80 steel pipe refers to a specific wall thickness of steel pipe, as defined by the ANSI/ASME B36.10M standard (for welded and seamless wrought steel pipe). It is thicker than Schedule 40, smaller inside diameter (for the same outside diameter), higher pressure rating, and greater weight per foot. It is used for heavy-duty, high-pressure, or harsh-environment applications.
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What is the thickness of Schedule 80 pipe?
Standard material: Common grades include ASTM A106 (seamless), ASTM A53 (welded), API 5L (pipeline steel).
Size range: 1/8"~24" (DN6~DN600), larger sizes need to be customized.
Wall thickness grade: The wall thickness of Sch 80 is about 1.5~2 times that of Sch 40 (for example, the wall thickness of 2" Sch 40 is 3.91mm, while that of Sch 80 is 5.54mm).
| Pipe Sch 80 chart, Dimensions, Weight And pipe Wall Thickness | ||||||
| Nominal size | Outside diameter | Wall thickness | Weight | |||
| inches | inches | mm | inches | mm | lb/ft | kg/m |
| 1/8" | 0.405 | 10.3 | 0.095 | 2.41 | 0.31 | 0.47 |
| 1/4" | 0.54 | 13.7 | 0.119 | 3.02 | 0.54 | 0.8 |
| 1/2" | 0.84 | 21.3 | 0.147 | 3.73 | 1.09 | 1.62 |
| 3/4" | 1.05 | 26.7 | 0.154 | 3.91 | 1.47 | 2.2 |
| 1" | 1.315 | 33.4 | 0.179 | 4.55 | 2.17 | 3.24 |
| 1 1/4" | 1.66 | 42.2 | 0.191 | 4.85 | 3 | 4.47 |
| 1 1/2" | 1.9 | 48.3 | 0.2 | 5.08 | 3.63 | 5.41 |
| 2 | 2.375 | 60.3 | 0.218 | 5.54 | 5.02 | 7.48 |
| 2 1/2" | 2.875 | 73 | 0.276 | 7.01 | 7.66 | 11.41 |
| 3" | 3.5 | 88.9 | 0.3 | 7.62 | 10.25 | 15.27 |
| 3 1/2" | 4 | 101.6 | 0.318 | 8.08 | 12.5 | 18.63 |
| 4" | 4.5 | 114.3 | 0.337 | 8.56 | 14.98 | 22.32 |
| 5" | 5.563 | 141.3 | 0.375 | 9.53 | 20.78 | 30.97 |
| 6" | 6.625 | 168.3 | 0.432 | 10.97 | 28.57 | 42.56 |
| 8" | 8.625 | 219.1 | 0.5 | 12.7 | 43.39 | 64.64 |
| 10" | 10.75 | 273 | 0.594 | 15.09 | 64.43 | 96.01 |
| 12" | 12.75 | 323.8 | 0.688 | 17.48 | 88.63 | 132.08 |
| 14" | 14 | 355.6 | 0.75 | 19.05 | 106.13 | 158.1 |
| 16" | 16 | 406.4 | 0.844 | 21.44 | 136.61 | 203.53 |
| 18" | 18 | 457 | 0.938 | 23.83 | 170.92 | 254.55 |
| 20" | 20 | 508 | 1.031 | 26.19 | 208.87 | 311.17 |
| 24" | 24 | 610 | 1.125 | 30.96 | 296.58 | 442.08 |
Contact Youfa Steel Pipe to obtain a quotation for SCH80 carbon steel pipes
Characteristics of Sch 80 steel pipe
Thicker Wall Thickness
No single thickness – it depends on the nominal pipe size (NPS).For the same NPS, Sch 80 is thicker than Sch 40 (e.g., 2″ pipe: Sch 40 = 0.154″, Sch 80 = 0.218″)
Inside Diameter (ID) is Smaller
Outside diameter (OD) is fixed for a given pipe size, regardless of schedule.
Thicker walls reduce the ID compared to Sch 40.
Example (2″ pipe): Sch 40 ID = 2.157″, Sch 80 ID = 1.939″.
This affects flow rate and fluid capacity.
Higher Pressure Rating
Thicker walls allow Sch 80 to withstand significantly higher internal pressures than Sch 40.
Typical working pressure is about 30–50% higher than Sch 40 (exact rating depends on material grade and temperature).
Heavier Weight per Foot
More steel means greater weight.
Example (2″ pipe): Sch 40 = 3.65 lb/ft; Sch 80 = 5.02 lb/ft.
Impacts handling, shipping costs, and structural support requirements.
Stronger & More Durable
Higher burst strength and resistance to mechanical damage.
Better for:
- Deep burial (resists collapse)
- High-vibration environments;
- Exposed piping where impact is a risk
Materials Available
Material Common use
- Carbon steel (ASTM A53/A106) High-pressure steam, oil, gas, water
- Stainless steel (ASTM A312) Corrosive fluids, high-purity, food/dairy
- Galvanized steel Water lines, mild corrosion resistance
Standard Compliance
Manufactured to ANSI/ASME B36.10M (welded and seamless).
Also meets ASTM standards like A53 (carbon steel) or A312 (stainless).
Threaded & Grooved Ends (Common)
Sch 80 wall is thick enough for reliable threading (unlike very thin schedules).
Often used with grooved couplings (Victaulic) or flanges.
Applications of Schedule 80 Carbon Steel Pipe
Schedule 80 carbon steel pipe features thick walls, high pressure resistance and strong mechanical strength, so it is widely used in heavy-duty, high-pressure and harsh working scenarios.
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High-Pressure Fluid Transport
Water, oil, natural gas and compressed air pipelines that require high pressure bearing; ideal for industrial circulating water systems.
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Oil & Gas Industry
Onshore oilfield gathering lines, low-pressure oil and gas transmission, petrochemical process piping.
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Power Plant & Heating Systems
High-temperature steam pipelines, boiler auxiliary piping, hot water circulation lines in thermal power plants.
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Chemical & Industrial Plants
General process pipelines for factories, medium transmission with certain pressure and temperature requirements.
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Fire Protection Systems
Industrial fire sprinkler main pipes, high-pressure fire water supply lines (required by some industrial codes).
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Mechanical & Structural Usage
Mechanical equipment support pipes, heavy-duty frame structures, casing and protective sleeve piping.
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Construction & Municipal Engineering
Underground buried pipelines with heavy load, industrial factory piping, cross-road protection pipes.
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Wastewater & Treatment Projects
Industrial sewage pipelines with pressure, strong wear and impact resistance.
